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Net Pension Assets - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Employer contributions | $ 3.5 |  |
Retirement of interest earned | 5.2 |  |
Actuarial loss recognized in other comprehensive income | $ 2.0 | $ 1.1 | $ 2.2
Seniority premium plan [member] |  |  |
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Percentage of eligible earnings accumulated as benefit | 1.92% |  |
Indemnity plan [member] |  |  |
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Percentage of eligible earnings accumulated as benefit | 6.54% |  |

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- Definition Contributions to plan by employer, net of regular contributions. + References No definition available. + Details
Name: | cpa_ContributionsToPlanByEmployerNetOfRegularContributions
Namespace Prefix: | cpa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Interest income on retirement. + References No definition available. + Details
Name: | cpa_InterestIncomeOnRetirement
Namespace Prefix: | cpa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Percentage of eligible earnings accumulated, as benefits. + References No definition available. + Details
Name: | cpa_PercentageOfEligibleEarningsAccumulatedAsBenefits
Namespace Prefix: | cpa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_iii&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cpa_SeniorityPremiumPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=cpa_IndemnityPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |